Experimental and theoretical equation of state of cubic boron nitride

Knittle, Elise; Wentzcovitch, Renata M.; Jeanloz, Raymond; Cohen, Marvin L.

doi:10.1038/337349a0

Cited by 314 publications

(150 citation statements)

References 25 publications

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“…On the other hand, superhard properties, i.e. extremely low compressibility of the same order of magnitude as in diamond, have been reported for cubic boron nitride [65], the tridymite-like phase of carbon dioxide [66], or superhard graphite [67].…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

Extensions and some recent applications of the Landau theory of phase transitions

Tolédano

2012

EPJ Web of Conferences

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The basic concepts of the Landau theory of phase transitions are introduced through working examples. A number of rules governing the application of the theory to second and first-order transitions are given. The approach to magnetostructural transitions in magnetic mulltiferroic materials is detailed. Examples of transitions induced by replica of the same order-parameter in superconducting and liquid crystal systems, are described. The theory of reconstructive transitions is outlined and illustrated by the examples of the graphite-diamond transition and by the phase diagram of iron. An extention of the phenomenological approach to incommensurate structures to the crystal-amorphous transition is proposed (see also the chapter by Perez-Mato et al. for further discussion and applications).

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Section: Epj Web Of Conferencesmentioning

confidence: 99%

Extensions and some recent applications of the Landau theory of phase transitions

Tolédano

2012

EPJ Web of Conferences

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“…4). If we maintain B' 0 to a fixed value of 4.0, the experimental value determined for c-BN [2] and usually used to compare solids between each others, we obtain B 0 = 337±4 GPa for c-CN x . Thus, the bulk modulus of the cubic carbon nitride appears remarkably high with a compressibility equivalent to 73% and 91% of diamond (this work) and c-BN [2] compressibilities, respectively.…”

Section: Goglio Et Al Revised Version Submitted To Diamond and Relamentioning

confidence: 99%

“…If we maintain B' 0 to a fixed value of 4.0, the experimental value determined for c-BN [2] and usually used to compare solids between each others, we obtain B 0 = 337±4 GPa for c-CN x . Thus, the bulk modulus of the cubic carbon nitride appears remarkably high with a compressibility equivalent to 73% and 91% of diamond (this work) and c-BN [2] compressibilities, respectively. Moreover, its performances appear better than the low-density cubic BC 2 N phase and comparable with this heterodiamond high-density polymorphs recently claimed (all BC 2 N polymorphs being elaborated under high pressure and temperature) [3,[30][31].…”

Section: Goglio Et Al Revised Version Submitted To Diamond and Relamentioning

confidence: 99%

“…Then, because it is the hardest material of all known solids, diamond appears fascinating and is currently used for cutting, drilling, grinding, or polishing tools in industry [1]. Cubic boron nitride (c-BN) ranks second among superhard materials and is widely used as abrasive [2]. Recently, BC 2 N heterodiamond was synthesized and found to exhibit an unusual combination of mechanical parameters as its bulk modulus is lower than that of c-BN while its Vickers hardness ranks second only after that of diamond [3].…”

Section: Introductionmentioning

confidence: 99%

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Evidence for a low-compressibility carbon nitride polymorph elaborated at ambient pressure and mild temperature

Goglio

Foy

Péchev

et al. 2009

Diamond and Related Materials

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Superhard materials like diamond are essential for abrasive or cutting tool applications. In this way, carbon nitrides are of relevant interest because they are expected to exhibit exceptional mechanical properties, high values of bulk modulus being predicted. A smart and simple method was used to synthesize carbon nitrides and allowed elaborating a low-compressibility polymorph. The processing consists in the decomposition of commercial thiosemicarbazide (H 2 NC(S)N 2 H 3 ) powder at ambient pressure and 600°C under nitrogen flow. Besides the presence of a graphitic C 3 N 4 phase, a nanocrystalline material is obtained and is identified as a cubic carbon nitride with a cell parameter of 3.163Å. Its impressive bulk modulus of 355GPa propels it as a challenger for cubic boron nitride among lowcompressibility materials. Thus, we prove that, in accordance with previous numerous theoretical predictions, crystalline carbon nitrides exhibit exceptional compressibility behaviour. Moreover, our synthesis strategy evidences that, despite usual admitted considerations, severe and expensive pressure and temperature conditions are not mandatory to elaborate low-compressibility covalent materials, which could give new insights for their development.

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“…The preliminary calculations of the ionicity [1,2], illustrate these features. The compounds BP, BAs and BSb crystallize, meanwhile, in the zinc blende structure although there are many theoretical first-principle [3,4] devoted to structural and electronic properties of BN, BP and BAs in their cubic phase, there are very few experimental data on these compounds [5,6]. The fundamental properties (not the network to balance and rigidity modulus) and electronic properties of BN, BP and BAs were studied by Wentzcovitch et al [7,8] which also discussed the properties of these materials to high pressure [9].…”

Section: Introductionmentioning

confidence: 99%

Structural and Electronic Properties of the BN, BP and BAs in the Different Phases of Zinc-Blende, NaCl and CsCl

2017

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In this work we used the first ab initio calculations to study the stability of the binary alloys BN, BP and BAs and their behavior in the different phases of zinc-blende, Nacl and CsCl. The full potential linearized augmented plane wave method was employed within density functional theory. Our results show the difference in the calculated structural properties and the band structure is obtained for the zinc-blende structure. We have investigated the lattice parameters and band gap energies. We also give the valence charge density at a high pressure and the analysis of the density of states.

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Experimental and theoretical equation of state of cubic boron nitride

Cited by 314 publications

References 25 publications

Extensions and some recent applications of the Landau theory of phase transitions

Extensions and some recent applications of the Landau theory of phase transitions

Evidence for a low-compressibility carbon nitride polymorph elaborated at ambient pressure and mild temperature

Structural and Electronic Properties of the BN, BP and BAs in the Different Phases of Zinc-Blende, NaCl and CsCl

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